Blame src/enc/syntax_enc.c

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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Header syntax writing
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include "src/utils/utils.h"
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#include "src/webp/format_constants.h"  // RIFF constants
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#include "src/webp/mux_types.h"         // ALPHA_FLAG
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#include "src/enc/vp8i_enc.h"
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//------------------------------------------------------------------------------
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// Helper functions
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static int IsVP8XNeeded(const VP8Encoder* const enc) {
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  return !!enc->has_alpha_;  // Currently the only case when VP8X is needed.
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                             // This could change in the future.
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}
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static int PutPaddingByte(const WebPPicture* const pic) {
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  const uint8_t pad_byte[1] = { 0 };
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  return !!pic->writer(pad_byte, 1, pic);
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}
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//------------------------------------------------------------------------------
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// Writers for header's various pieces (in order of appearance)
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static WebPEncodingError PutRIFFHeader(const VP8Encoder* const enc,
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                                       size_t riff_size) {
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  const WebPPicture* const pic = enc->pic_;
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  uint8_t riff[RIFF_HEADER_SIZE] = {
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    'R', 'I', 'F', 'F', 0, 0, 0, 0, 'W', 'E', 'B', 'P'
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  };
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  assert(riff_size == (uint32_t)riff_size);
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  PutLE32(riff + TAG_SIZE, (uint32_t)riff_size);
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  if (!pic->writer(riff, sizeof(riff), pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8XHeader(const VP8Encoder* const enc) {
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  const WebPPicture* const pic = enc->pic_;
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  uint8_t vp8x[CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE] = {
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    'V', 'P', '8', 'X'
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  };
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  uint32_t flags = 0;
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  assert(IsVP8XNeeded(enc));
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  assert(pic->width >= 1 && pic->height >= 1);
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  assert(pic->width <= MAX_CANVAS_SIZE && pic->height <= MAX_CANVAS_SIZE);
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  if (enc->has_alpha_) {
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    flags |= ALPHA_FLAG;
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  }
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  PutLE32(vp8x + TAG_SIZE,              VP8X_CHUNK_SIZE);
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  PutLE32(vp8x + CHUNK_HEADER_SIZE,     flags);
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  PutLE24(vp8x + CHUNK_HEADER_SIZE + 4, pic->width - 1);
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  PutLE24(vp8x + CHUNK_HEADER_SIZE + 7, pic->height - 1);
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  if (!pic->writer(vp8x, sizeof(vp8x), pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  return VP8_ENC_OK;
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}
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static WebPEncodingError PutAlphaChunk(const VP8Encoder* const enc) {
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  const WebPPicture* const pic = enc->pic_;
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  uint8_t alpha_chunk_hdr[CHUNK_HEADER_SIZE] = {
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    'A', 'L', 'P', 'H'
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  };
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  assert(enc->has_alpha_);
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  // Alpha chunk header.
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  PutLE32(alpha_chunk_hdr + TAG_SIZE, enc->alpha_data_size_);
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  if (!pic->writer(alpha_chunk_hdr, sizeof(alpha_chunk_hdr), pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  // Alpha chunk data.
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  if (!pic->writer(enc->alpha_data_, enc->alpha_data_size_, pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  // Padding.
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  if ((enc->alpha_data_size_ & 1) && !PutPaddingByte(pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8Header(const WebPPicture* const pic,
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                                      size_t vp8_size) {
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  uint8_t vp8_chunk_hdr[CHUNK_HEADER_SIZE] = {
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    'V', 'P', '8', ' '
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  };
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  assert(vp8_size == (uint32_t)vp8_size);
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  PutLE32(vp8_chunk_hdr + TAG_SIZE, (uint32_t)vp8_size);
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  if (!pic->writer(vp8_chunk_hdr, sizeof(vp8_chunk_hdr), pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8FrameHeader(const WebPPicture* const pic,
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                                           int profile, size_t size0) {
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  uint8_t vp8_frm_hdr[VP8_FRAME_HEADER_SIZE];
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  uint32_t bits;
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  if (size0 >= VP8_MAX_PARTITION0_SIZE) {  // partition #0 is too big to fit
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    return VP8_ENC_ERROR_PARTITION0_OVERFLOW;
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  }
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  // Paragraph 9.1.
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  bits = 0                         // keyframe (1b)
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       | (profile << 1)            // profile (3b)
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       | (1 << 4)                  // visible (1b)
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       | ((uint32_t)size0 << 5);   // partition length (19b)
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  vp8_frm_hdr[0] = (bits >>  0) & 0xff;
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  vp8_frm_hdr[1] = (bits >>  8) & 0xff;
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  vp8_frm_hdr[2] = (bits >> 16) & 0xff;
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  // signature
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  vp8_frm_hdr[3] = (VP8_SIGNATURE >> 16) & 0xff;
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  vp8_frm_hdr[4] = (VP8_SIGNATURE >>  8) & 0xff;
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  vp8_frm_hdr[5] = (VP8_SIGNATURE >>  0) & 0xff;
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  // dimensions
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  vp8_frm_hdr[6] = pic->width & 0xff;
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  vp8_frm_hdr[7] = pic->width >> 8;
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  vp8_frm_hdr[8] = pic->height & 0xff;
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  vp8_frm_hdr[9] = pic->height >> 8;
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  if (!pic->writer(vp8_frm_hdr, sizeof(vp8_frm_hdr), pic)) {
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    return VP8_ENC_ERROR_BAD_WRITE;
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  }
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  return VP8_ENC_OK;
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}
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// WebP Headers.
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static int PutWebPHeaders(const VP8Encoder* const enc, size_t size0,
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                          size_t vp8_size, size_t riff_size) {
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  WebPPicture* const pic = enc->pic_;
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  WebPEncodingError err = VP8_ENC_OK;
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  // RIFF header.
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  err = PutRIFFHeader(enc, riff_size);
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  if (err != VP8_ENC_OK) goto Error;
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  // VP8X.
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  if (IsVP8XNeeded(enc)) {
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    err = PutVP8XHeader(enc);
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    if (err != VP8_ENC_OK) goto Error;
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  }
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  // Alpha.
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  if (enc->has_alpha_) {
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    err = PutAlphaChunk(enc);
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    if (err != VP8_ENC_OK) goto Error;
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  }
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  // VP8 header.
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  err = PutVP8Header(pic, vp8_size);
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  if (err != VP8_ENC_OK) goto Error;
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  // VP8 frame header.
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  err = PutVP8FrameHeader(pic, enc->profile_, size0);
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  if (err != VP8_ENC_OK) goto Error;
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  // All OK.
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  return 1;
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  // Error.
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 Error:
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  return WebPEncodingSetError(pic, err);
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}
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// Segmentation header
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static void PutSegmentHeader(VP8BitWriter* const bw,
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                             const VP8Encoder* const enc) {
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  const VP8EncSegmentHeader* const hdr = &enc->segment_hdr_;
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  const VP8EncProba* const proba = &enc->proba_;
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  if (VP8PutBitUniform(bw, (hdr->num_segments_ > 1))) {
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    // We always 'update' the quant and filter strength values
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    const int update_data = 1;
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    int s;
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    VP8PutBitUniform(bw, hdr->update_map_);
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    if (VP8PutBitUniform(bw, update_data)) {
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      // we always use absolute values, not relative ones
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      VP8PutBitUniform(bw, 1);   // (segment_feature_mode = 1. Paragraph 9.3.)
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      for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
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        VP8PutSignedBits(bw, enc->dqm_[s].quant_, 7);
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      }
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      for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
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        VP8PutSignedBits(bw, enc->dqm_[s].fstrength_, 6);
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      }
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    }
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    if (hdr->update_map_) {
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      for (s = 0; s < 3; ++s) {
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        if (VP8PutBitUniform(bw, (proba->segments_[s] != 255u))) {
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          VP8PutBits(bw, proba->segments_[s], 8);
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        }
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      }
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    }
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  }
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}
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// Filtering parameters header
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static void PutFilterHeader(VP8BitWriter* const bw,
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                            const VP8EncFilterHeader* const hdr) {
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  const int use_lf_delta = (hdr->i4x4_lf_delta_ != 0);
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  VP8PutBitUniform(bw, hdr->simple_);
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  VP8PutBits(bw, hdr->level_, 6);
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  VP8PutBits(bw, hdr->sharpness_, 3);
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  if (VP8PutBitUniform(bw, use_lf_delta)) {
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    // '0' is the default value for i4x4_lf_delta_ at frame #0.
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    const int need_update = (hdr->i4x4_lf_delta_ != 0);
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    if (VP8PutBitUniform(bw, need_update)) {
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      // we don't use ref_lf_delta => emit four 0 bits
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      VP8PutBits(bw, 0, 4);
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      // we use mode_lf_delta for i4x4
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      VP8PutSignedBits(bw, hdr->i4x4_lf_delta_, 6);
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      VP8PutBits(bw, 0, 3);    // all others unused
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    }
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  }
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}
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// Nominal quantization parameters
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static void PutQuant(VP8BitWriter* const bw,
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                     const VP8Encoder* const enc) {
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  VP8PutBits(bw, enc->base_quant_, 7);
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  VP8PutSignedBits(bw, enc->dq_y1_dc_, 4);
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  VP8PutSignedBits(bw, enc->dq_y2_dc_, 4);
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  VP8PutSignedBits(bw, enc->dq_y2_ac_, 4);
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  VP8PutSignedBits(bw, enc->dq_uv_dc_, 4);
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  VP8PutSignedBits(bw, enc->dq_uv_ac_, 4);
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}
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// Partition sizes
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static int EmitPartitionsSize(const VP8Encoder* const enc,
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                              WebPPicture* const pic) {
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  uint8_t buf[3 * (MAX_NUM_PARTITIONS - 1)];
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  int p;
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  for (p = 0; p < enc->num_parts_ - 1; ++p) {
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    const size_t part_size = VP8BitWriterSize(enc->parts_ + p);
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    if (part_size >= VP8_MAX_PARTITION_SIZE) {
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      return WebPEncodingSetError(pic, VP8_ENC_ERROR_PARTITION_OVERFLOW);
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    }
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    buf[3 * p + 0] = (part_size >>  0) & 0xff;
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    buf[3 * p + 1] = (part_size >>  8) & 0xff;
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    buf[3 * p + 2] = (part_size >> 16) & 0xff;
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  }
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  return p ? pic->writer(buf, 3 * p, pic) : 1;
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}
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//------------------------------------------------------------------------------
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static int GeneratePartition0(VP8Encoder* const enc) {
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  VP8BitWriter* const bw = &enc->bw_;
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  const int mb_size = enc->mb_w_ * enc->mb_h_;
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  uint64_t pos1, pos2, pos3;
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  pos1 = VP8BitWriterPos(bw);
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  if (!VP8BitWriterInit(bw, mb_size * 7 / 8)) {        // ~7 bits per macroblock
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    return WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
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  }
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  VP8PutBitUniform(bw, 0);   // colorspace
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  VP8PutBitUniform(bw, 0);   // clamp type
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  PutSegmentHeader(bw, enc);
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  PutFilterHeader(bw, &enc->filter_hdr_);
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  VP8PutBits(bw, enc->num_parts_ == 8 ? 3 :
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                 enc->num_parts_ == 4 ? 2 :
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                 enc->num_parts_ == 2 ? 1 : 0, 2);
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  PutQuant(bw, enc);
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  VP8PutBitUniform(bw, 0);   // no proba update
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  VP8WriteProbas(bw, &enc->proba_);
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  pos2 = VP8BitWriterPos(bw);
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  VP8CodeIntraModes(enc);
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  VP8BitWriterFinish(bw);
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  pos3 = VP8BitWriterPos(bw);
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#if !defined(WEBP_DISABLE_STATS)
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  if (enc->pic_->stats) {
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    enc->pic_->stats->header_bytes[0] = (int)((pos2 - pos1 + 7) >> 3);
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    enc->pic_->stats->header_bytes[1] = (int)((pos3 - pos2 + 7) >> 3);
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    enc->pic_->stats->alpha_data_size = (int)enc->alpha_data_size_;
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  }
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#else
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  (void)pos1;
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  (void)pos2;
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  (void)pos3;
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#endif
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  if (bw->error_) {
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    return WebPEncodingSetError(enc->pic_, VP8_ENC_ERROR_OUT_OF_MEMORY);
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  }
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  return 1;
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}
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void VP8EncFreeBitWriters(VP8Encoder* const enc) {
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  int p;
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  VP8BitWriterWipeOut(&enc->bw_);
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  for (p = 0; p < enc->num_parts_; ++p) {
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    VP8BitWriterWipeOut(enc->parts_ + p);
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  }
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}
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int VP8EncWrite(VP8Encoder* const enc) {
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  WebPPicture* const pic = enc->pic_;
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  VP8BitWriter* const bw = &enc->bw_;
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  const int task_percent = 19;
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  const int percent_per_part = task_percent / enc->num_parts_;
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  const int final_percent = enc->percent_ + task_percent;
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  int ok = 0;
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  size_t vp8_size, pad, riff_size;
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  int p;
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  // Partition #0 with header and partition sizes
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  ok = GeneratePartition0(enc);
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  if (!ok) return 0;
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  // Compute VP8 size
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  vp8_size = VP8_FRAME_HEADER_SIZE +
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             VP8BitWriterSize(bw) +
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             3 * (enc->num_parts_ - 1);
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  for (p = 0; p < enc->num_parts_; ++p) {
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    vp8_size += VP8BitWriterSize(enc->parts_ + p);
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  }
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  pad = vp8_size & 1;
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  vp8_size += pad;
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  // Compute RIFF size
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  // At the minimum it is: "WEBPVP8 nnnn" + VP8 data size.
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  riff_size = TAG_SIZE + CHUNK_HEADER_SIZE + vp8_size;
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  if (IsVP8XNeeded(enc)) {  // Add size for: VP8X header + data.
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    riff_size += CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE;
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  }
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  if (enc->has_alpha_) {  // Add size for: ALPH header + data.
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    const uint32_t padded_alpha_size = enc->alpha_data_size_ +
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                                       (enc->alpha_data_size_ & 1);
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    riff_size += CHUNK_HEADER_SIZE + padded_alpha_size;
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  }
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  // Sanity check.
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  if (riff_size > 0xfffffffeU) {
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    return WebPEncodingSetError(pic, VP8_ENC_ERROR_FILE_TOO_BIG);
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  }
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  // Emit headers and partition #0
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  {
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    const uint8_t* const part0 = VP8BitWriterBuf(bw);
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    const size_t size0 = VP8BitWriterSize(bw);
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    ok = ok && PutWebPHeaders(enc, size0, vp8_size, riff_size)
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            && pic->writer(part0, size0, pic)
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            && EmitPartitionsSize(enc, pic);
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    VP8BitWriterWipeOut(bw);    // will free the internal buffer.
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  }
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  // Token partitions
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  for (p = 0; p < enc->num_parts_; ++p) {
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    const uint8_t* const buf = VP8BitWriterBuf(enc->parts_ + p);
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    const size_t size = VP8BitWriterSize(enc->parts_ + p);
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    if (size) ok = ok && pic->writer(buf, size, pic);
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    VP8BitWriterWipeOut(enc->parts_ + p);    // will free the internal buffer.
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    ok = ok && WebPReportProgress(pic, enc->percent_ + percent_per_part,
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                                  &enc->percent_);
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  }
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  // Padding byte
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  if (ok && pad) {
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    ok = PutPaddingByte(pic);
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  }
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  enc->coded_size_ = (int)(CHUNK_HEADER_SIZE + riff_size);
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  ok = ok && WebPReportProgress(pic, final_percent, &enc->percent_);
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  return ok;
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}
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//------------------------------------------------------------------------------
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